2004 GMC ENVOY XUV Engine And Engine Coolingcooling System Problems

I PURCHASED A 2004 GMC ENVOY XUV AND HAVE SEVERAL SIGNIFICANT PROBLEMS WITH THIS VEHICLE. AFTER RESEARCHING IT SEEM OTHERS HAVE HAD THE SAME TROUBLES. SINCE WE OWNED THE VEHICLE, THE REAR WINDOW IS FOUND DOWN AND NOONE WAS EVEN IN/NEAR THE VEHICLE. IT CONTINUES TO WORK BUT STILL WILL GO DOWN BY ITSELF. A YEAR AGO I HAD TO REPLACE THE FUEL TANK, THIS WAS RIGHT AFTER WE TOOK IT IN FOR INSPECTION ON A RECALL OF SMELLING GAS FUMES WHILE DRIVING AND POSSIBLE CORROSION IN FUEL LINES. OF COURSE THE FUEL LINES WERE NOT CORRODED SO WE WERE TOLD. I FOOTED THE BILL $800+ TO GET A NEW FUEL TANK ,AS NECK ON TANK WAS CRACKED AND WAS TOLD THAT THIS IS WHY WE SMELLED GAS. LUCKILY, I WENT TO MY GARAGE AND SAVED SEVERAL HUNDRED DOLLARS FROM THE DEALERS COST TO REPAIR. LAST WEEKEND 9/10/10 MY FAMILY...

I HAVE A 2004 SUV XLT. I BOUGHT MY CAR WITH 400 MILES ON IT. I HAD THE GAS TANK REPLACED EARLY ON. WENT BACK TO GMC B/C THEY HAD NOT INSTALLED IT PROPERLY. I'VE HAD BOTH FRONT AND REAR SWAY BARS REPLACED AND BOTH KNOCK SENSORS REPLACED. MY MIDDLE WINDOW DECIDED TO QUIT WORKING AND I HAVEN'T GOTTEN IT FIXED BECAUSE THE GUYS AT THE GMC SERVICE CENTER SAID THEY COULDN'T IMAGINE WHAT IT COULD BE AND THEY WOULD HAVE TO CHARGE ME $100 FOR A DIAGNOSIS!! MY RADIO/CD PLAYER IS ONLY HALF LIT UP AND STOPS WORKING WHEN IT GETS TOO HOT FROM PLAYING A CD... I AM CURRENTLY HAVING ISSUES WITH THE FAN CLUTCH, THERMOSTAT AND A LEAK IN MY FRONT DIFFERENTIAL. MEANWHILE THE GUYS AT THE DEALERSHIP WANTED TO CHARGE ME $1,500 TO REPLACE MY KNOCK SENSORS AGAIN AND DIDN'T EVEN FIND THE LEAK WHEN THEY...